Striking punch



Feb. 6, 1962 H. M. HILL STRIKING PUNCH Filed Oct. 7, 1959 ATTORNEY ijnited rates 3,019,713 STRIKDJG PUNCH Howard M. Hill, Hamilton, Va. Filed Get. 7, 1959, Ser. No. 845,003 1 Claim. (Cl. 93-665) This invention relates to apparatus used in making fibre containers and is directed particularly toward the striking punches used in various operations necessary for the assembly of container parts.

The apparatus shown in the drawing is most useful in the operations of curling and sealing fibre containers of the type disclosed in my co-pending application #728,846 filed on April 16, 1958 but the invention may be usefully employed in other operations.

An object of the invention is the elimination of waste due to loss of control over container parts during their assembly into finished containers.

Another object is to increase the speed at which containers may be made, through accurate registry of container parts within the tools.

Another object is simplification of tools by eliminating movable parts sometimes used in striking punches of the type necessary for the assembly of fibre containers.

Numerous other objects and advantages of the invention may be apparent as it is better understood from the following description which, taken in connection with the accompanying drawing, discloses a preferred embodiment thereof.

Referring to the drawings:

FIGURE 1 is a perspective view of the striking punch of the instant invention in position over a container of the type to be operated upon, with the hingeable shield of the container protruding through a slot in the striking punch and showing four supporting jaws partially broken away and one retracted to show container detail;

FIGURE 2 is a vertical section of the punch and container and supporting jaws taken substantially along a plane indicated by the line 22 in FIG. 1 but with the punch withdrawn from the container to show entering conditions and with supporting jaws for the container partially broken away;

FIGURE 3 is a vertical section taken along lines 3-3 in FIG. 1 showing the striking punch resting upon the container flanges and the plug carrying shield entrapped by guide members within the punch, the corners of the shield protruding through slots at two punch corners;

FIGURE 4 is a vertical section similar to FIG. 3 but with the punch withdrawn from the container to show entering and exiting conditions;

FIGURE 5 is a horizontal section taken along line 5-5 in FIG. 2 showing the shield ready to enter the punch slot.

As a preferred embodiment of the instant invention the drawings illustrate a striking punch and supporting jaws operating on a container of the type disclosed in my copending application #728,846 which issued as Patent No. 2,920,806. In such a container an end member 11 carrying a shield 12 and plug 13 is assembled as a unit to a container body 14. In FIG. 2 this assembly has been made and end member 11 is loosely held by end seam flanges 15 which are crimped or curled to the position shown in FIG. 2 approximately 45 degrees from the plane of end member 11. When the assembly reaches this stage the shield occupies the position shown by dotted lines and is brought to an upright position by means of an air jet 16 directed as shown by nozzle 1'7 against the under surface of the outer end of shield 12 causing it to hinge about hinge line 18 and assume the position shown with the plug 13 resting against backing face 19 of striking punch 20. With the shield and plug in this position the striking punch 20 descends toward container flanges 15 which together with end retaining shoulder 21 are supported by jaws 22. As the striking punch descends shield 12 is gradually entrapped by guide members 23 which lead the shield into narrow clearance slot 24 in striking punch 20 (FIG. 5). The striking punch continues its descent until the condition shown in FIG. 3 is reached with end seam flanges 15 set down against end member 11 while the corners of shield 12 rest in a vertical position confined by slot 24 in striking punch 20. As the punch recedes (FIG. 4) shield 12 is freed by guide members 23 and on retraction of jaws 22 the container may be moved to a succeeding station.

It is thought that the invention and many of its advantages will be understood from the foregoing description, and it will be apparent that changes may be made in the construction and arrangement of the parts without departing from the spirit and scope of the invention, the form hereinbefore described being a preferred embodiment thereof.

I claim:

A punch, adapted to strike and form a container end seam flange, comprising four vertical walls connected at their upper end and open at their lower end said walls abutting at four corners and forming a rectangle, two narrow slots situated at the junction of said vertical Walls at two opposite corners of said rectangle and extending upwardly from the lower edge of said abutting walls providing clearance for an upright member of a container structure said upright member extending through said container end seam flange and means within said four vertical punch walls confining and guiding said upright member of a container structure against motion from an upright position while the striking face of said punch approaches and strikes said container end seam flange.

Hothersall May 28, 1940 Bergstein et a1 May 26, 1959 

